Bayonet connection structure between container mouth portion and cap

Abstract

A bayonet connection structure between a container mouth portion and a cap is disclosed. The cap includes multiple slip prevention claws spaced apart from each other. One of the slip prevention claws is elastically displaceable in a radial direction. A rotation prevention projection is provided between the elastically-displaceable slip prevention claw and the other slip prevention claws. The mouth portion has a hollow cylindrical portion with an outer circumferential surface provided with multiple slip prevention claw (SPC) engagement portions for the slip prevention claws. The SPC engagement portions are as many as the slip prevention claws. Each of the SPC engagement portions has an end in a clockwise direction provided with a rotation prevention stopper. The mouth portion includes a rotation prevention rib to be got over by the rotation prevention projection of the cap when the cap is rotated.

The invention claimed is: 
     
       1. A bayonet connection structure between a mouth portion of a container and a cap on which a pump dispenser is mounted,
 the cap comprising:
 an inner circumferential surface that is in a circular shape in a top view of the cap, 
 at least three of slip prevention claws ( 12 ,  13 ) that are provided on the inner circumferential surface, each of the slip prevention claws having an inner inclined surface that faces obliquity downward, and 
 
 the mouth portion comprising:
 an outer circumferential surface that is in a circular shape in a top view of the mouth portion, 
 three of engagement portions ( 23 ) that are arranged on the outer circumferential surface in correspondence with the slip prevention claws such that one of the engagement portions meets one of the slip prevention claws when the cap is engaged with the mouth portion, each of the engagement portions having an outer inclined surface that faces obliquity upward such that the inner inclined surfaces of the cap run over the outer inclined surfaces of the mouth portion when the cap is pressed downward, wherein 
 
 a slit is formed behind one of the slip prevention claws, the slit extending in an axial direction such that the elastic claw is bent in a radial direction within the slit, having an opening that is disposed at a lower edge of the cap such that a lower portion of the slip prevention claw is more deformed than an upper portion of the slip prevention claw, the slip prevention claw being defined as an elastic claw ( 12 ), 
 two of the slip prevention claws are defined as stable claws ( 13 ) behind which no slit is formed such that the stable claws are barely deformed in the radial direction, 
 seen from the top view of the cap, where the elastic claw is positioned at 9 o'clock, the stable claws are positioned between 12 o'clock and 6 o'clock such that no portion of the stable claws are positioned between 6 o'clock and 12 o'clock, and no other elastic claw is provided, 
 one of the engagement portions that correspond to one of the stable claws is provided with a stopper ( 24 ) at an end thereof, the end being positioned at a downstream side of the engagement portion in a clockwise direction from the top view, 
 the stopper is configured with an upper portion and a lower portion, both of which are linearly arranged in the axial direction of the mouth portion,
 the upper portion protruding upward from the outer inclined surface of the engagement portion in the axial direction so that the inner inclined surface of the corresponding stable claw is aligned with the outer inclined surface by contacting an end of the inner inclined surface to the stopper, and 
 the lower portion protruding downward from the outer inclined surface in the axial direction so that the stable claw is blocked to further rotate toward the clockwise direction when the stable claw is engaged with the engagement portion, 
 
 a rotation prevention projection ( 14 ), which extends in the axial direction and protrudes inwardly in the radial direction, is provided on the inner circumferential surface of the cap, being distant from one of the stable claws by a projection distance in the clockwise direction, 
 a rotation prevention rib, extends in the axial direction and protrudes outwardly in the radial direction, is provided on the outer circumferential surface of the mouth portion, being distant from the end of the stopper that corresponds to the stable claw in the clockwise direction by a rib distance that is the same as the projection distance so that, when the stable claw meets the stopper, the rotation prevention projection simultaneously gets over the rotation prevention rib. 
 
     
     
       2. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the pump dispenser includes a case body supporting a pump, and the cap, and the case body and the cap are integrally formed. 
 
     
     
       3. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the pump dispenser includes a case body supporting a pump and the cap, the case body and the cap are formed of separate members, and the case body and the cap are mounted by fitting. 
 
     
     
       4. The bayonet connection structure between the mouth portion of the container and the cap between according to  claim 1 , wherein
 the pump dispenser is a trigger pump dispenser. 
 
     
     
       5. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the pump dispenser is a push pump dispenser. 
 
     
     
       6. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the pump dispenser is a pressure accumulator pump dispenser. 
 
     
     
       7. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 only one of the elastic claw is provided. 
 
     
     
       8. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the other of the slip prevention claw engagement portions also has the stopper having the protruding portions. 
 
     
     
       9. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the rotation prevention rib protrudes upward in the axial direction from the outer inclined surface of the mouth portion to the same height as the protruding portion of the stopper. 
 
     
     
       10. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the cap is provided with only three of the slip prevention claws; and 
 the mouth portion is provided with only three of the engagement portions. 
 
     
     
       11. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 the stable claws are positioned between 1 o'clock and 5 o'clock where the elastic claw is positioned at 9 o'clock. 
 
     
     
       12. The bayonet connection structure between the mouth portion of the container and the cap according to  claim 1 , wherein
 another rotation prevention projection ( 14 ), which extends in the axial direction and protrudes inwardly in the radial direction, is provided on the inner circumferential surface of the cap, being distant from the other of the stable claws by another projection distance in the anti-clockwise direction, 
 another rotation prevention rib, extends in the axial direction and protrudes outwardly in the radial direction, is provided on the outer circumferential surface of the mouth portion, being distant from the end of the stopper that corresponds to the other stable claw in the anti-clockwise direction by another rib distance that is the same as the another projection distance so that, when the other stable claw meets the stopper, the another rotation prevention projection simultaneously gets over the another rotation prevention rib.